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Agar hydrogel drops freeze vertically due to their solid polymer matrix, unlike water. This unique freezing behavior allows for predictive modeling of deformation for various shapes.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Fluid Dynamics

Background:

  • Droplet freezing is crucial in various fields, but its behavior differs significantly between pure liquids and complex fluids.
  • Previous studies on freezing droplets primarily focused on water, observing different deformation patterns.
  • Agar hydrogels, a type of biopolymer gel, possess unique viscoelastic properties that influence their freezing dynamics.

Purpose of the Study:

  • To investigate the directional freezing behavior of agar hydrogel drops on a low-temperature substrate.
  • To understand the role of the viscoelastic polymer matrix in hydrogel droplet deformation during freezing.
  • To develop predictive models for hydrogel droplet freezing and compare them with water droplet freezing.

Main Methods:

  • Directional freezing experiments were conducted using agar hydrogel drops on a cooled copper substrate.
  • Microscopic observations and measurements were used to analyze the deformation of freezing hydrogel drops.
  • Two distinct mathematical models were derived to describe the freezing deformation of 2D water droplets and hydrogels.

Main Results:

  • Agar hydrogel droplets exhibited strictly vertical expansion during freezing, contrasting with the reorganization seen in water droplets.
  • The viscoelastic nature of the hydrogel matrix restricted deformation of the unfrozen portion, leading to elongation along the temperature gradient.
  • The developed models accurately predicted the observed freezing deformation for both hydrogels and water droplets.
  • The model demonstrated predictive capability for different hydrogel shapes, independent of container molds.

Conclusions:

  • The viscoelastic solid polymer matrix in agar hydrogels dictates a unique vertical freezing expansion.
  • The derived models provide a quantitative understanding of hydrogel droplet freezing and deformation.
  • This research offers insights into controlling hydrogel morphology through freezing, with potential applications in materials fabrication.